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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Characteristics of Radio Emissions Associated With Terrestrial Gamma-Ray Flashes
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Characteristics of Radio Emissions Associated With Terrestrial Gamma-Ray Flashes

机译：广播的特点与排放地面伽马射线闪光

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In this study, we analyze 44 terrestrial gamma-ray flashes (TGFs) detected by the Fermi Gamma-ray Burst Monitor (GBM) occurring in 2014-2016 in conjunction with data from the U.S. National Lightning Detection Network (NLDN). We examine the characteristics of magnetic field waveforms measured by NLDN sensors for 61 pulses that occurred within 5 ms of the start-time of the TGF photon flux. For 21 (out of 44) TGFs, the associated NLDN pulse occurred almost simultaneously with (that is, within 200 μs of) the TGF. One TGF had two NLDN pulses within 200 μs. The median absolute time interval between the beginning of these near-simultaneous pulses and the TGF flux start-time is 50 μs. We speculate that these RF pulses are signatures of either TGF-associated relativistic electron avalanches or currents traveling in conducting paths "preconditioned" by TGF-associated electron beams. Compared to pulses that were not simultaneous with TGFs (but within 5 ms of one), simultaneous pulses had higher median absolute peak current (26 kA versus 11 kA), longer median threshold-to-peak rise time (14 μs versus 2.8 μs), and longer median peak-to-zero time (15 μs versus 5.5 μs). A majority (77%) of our simultaneous RF pulses had NLDN-estimated peak currents less than 50 kA indicating that TGF emissions can be associated with moderate-peak-amplitude processes. The lightning flash associated with one of the TGFs in our data set was observed by a Lightning Mapping Array, which reported a relatively high-power source at an altitude of 25 km occurring 101 μs after the GBM-reported TGF discovery-bin start-time.
机译：在这项研究中,我们分析44地面伽马射线由费米伽马射线闪光(tgf信号)检测破裂监测(GBM)发生在2014 - 2016年与来自美国国家的数据闪电探测网络(NLDN)。磁场波形的特点61年衡量NLDN传感器脉冲发生在5 ms的TGF的启动时间光子通量。几乎NLDN脉冲发生有关同时(即200μs(内)TGF。μs。这些近乎同步脉冲和开始TGF通量的启动时间是50μs。这些射频脉冲的签名TGF-associated相对论电子雪崩或电流在导电路径旅行“预处理”TGF-associated电子梁。同时与tgf信号(但在5 ms之一),有更高的平均绝对同步脉冲峰值电流(26 kA和11 kA),时间值threshold-to-peak上升时间(14μs和2.8μs)和更长的平均peak-to-zero时间(15μs与5.5μs)。同时射频脉冲NLDN-estimated高峰电流小于50 kA表明TGF可以与排放moderate-peak-amplitude流程。flash与tgf信号在我们的数据之一观察组由一个闪电映射数组,据报道一个相对高功率源在哪里25公里的高度101μs后发生GBM-reported TGF discovery-bin启动时间。

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